I agree something is not right in this tale.

NP doesn't ship partial shipments of a single product.

If the radio was a separate component, and the plane could not be shipped out, then you are ONLY charged for what was shipped out.
You cannot be charged for something that you'll never receive.

Nitro always advises me ( via e-mail, though I've been called twice ) if there is a reason something on my order is no longer available, then they ask what I would like to do.

You should check the charges on your card and the confirmation e-mail you received.

I'll bet you'll only see the separate radio show up.

Also as indicated contact John as indicated with your order number.